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A solid-state device, with the robust polymer film, exhibited excellent electrochromic (EC) properties, with high optical contrast (ΔT 65%) and high durability after repeated color changes for 15 000 cycles, upon applying low-operating voltages (+1.5/0 V).Tetragonal NaVPO4F has been regarded as an ideal cathode for sodium-ion batteries because of its high average plateau (3.8 V) and theoretical specific capacity (143 mA h g-1). However, the Na-storage performance is still hindered by unsatisfying thermal stability and poor condu